In a glass bowl, toss the scallops with the lime juice.,Cover and refrigerate for about 45 minutes, stirring occasionally, until the scallops just start to turn opaque.,______,Season the aguachile with salt.,Pour off all but 2 tablespoons of the lime juice from the scallops.,Add 3 to 4 tablespoons of the aguachile to the scallops and mix well; reserve the remaining aguachile for another use.,Fold in the onion and the thinly sliced cucumber and season with salt.,Spoon into bowls or glasses and serve with tostadas or tortilla chips.